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Frankenmotor issues

Recently did a frankenmotor with 220 cams in it. Using HLA's. The motor keeps going through them. Oil pressure drops when I accelerate as well and than rises to normal again. Could this be due to a couple collapsed lifters?

If the pressure is dropping the bypass valve in the oil pump could be damaged or just worn.
Also possible the pickup tube is not sealed properly (o-ring is bad/missing), or the screen is clogged, or the tube is cracked.
Did you use RTV on the pump housing to block seal? RTV is known to have little bits break away and clog the feed ports to the rocker shafts.

The hla are very small pasages on them and takes a tiny peice of anything to plug them but they are removeabble and can be cleaned and reused. But in your case i whould be planeing the rocker holdown posts to get the hlas closer to compensate for cam grind. The amont thats been ground is the amount that the rocker train should be planed to make geomitry right. or roller cams and valve train thats addjustabble carfull cams are matched to valve train so no mixmatching